D-Link DIR-823X Command Injection Vulnerability
D-Link DIR-823X contains a command injection vulnerability that allows an authorized attacker to execute arbitrary commands on remote devices by sending a POST request to /goform/set_prohibiting via the corresponding function. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.
Browse Remote Code Execution security risksQuick answer
D-Link DIR-823X should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- 240126
- 240802
- -
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2025-29635 affects D-Link DIR-823X devices and the vendor advisory identifies the product as end-of-life and end-of-service. Because supported firmware development has ended, the reliable fix is to retire and replace the router rather than depend on a future patch. If immediate replacement is not possible, reduce exposure while planning replacement by disabling remote administration, using the newest available firmware, and isolating the device.
- Identify all D-Link DIR-823X devices, hardware revisions, firmware versions, and whether any management interface is exposed to WAN or untrusted networks.
- Schedule replacement with a supported router or firewall platform; treat continued DIR-823X use as residual risk.
- Until replacement is complete, install the latest firmware available for the exact region and hardware revision if one exists.
- Disable WAN-side administration, UPnP, unnecessary port forwarding, cloud management, and any unused services.
- Set a unique strong administrator password and rotate Wi-Fi credentials where the device may have been exposed.
- Place the device behind a trusted upstream firewall or isolate it from sensitive internal networks.
- Monitor for unexpected DNS changes, port forwards, new users, configuration changes, or outbound traffic spikes.
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Verify the fix
- Confirm the affected DIR-823X device has been replaced, or document the accepted temporary risk and mitigation owner.
- Verify remote administration and unnecessary services are disabled from the WAN side.
- Scan from an external network and confirm no management interface is publicly reachable.
- Review configuration backups for unauthorized changes before and after mitigation.
- Run a Fixnx scan against public assets behind the router after replacement or isolation.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2025-29635?
D-Link DIR-823X should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.